Comparison of the Difficulty of Senior High School Chemistry Compulsory Courses Under the New and Old Curriculum Standards
QIAN Sheng1,2*, ZHENG Chang-Long3
1. Institute of Teacher Education, Northeast Normal University, Changchun 130024, China;
2. Chongqing Academy of Educational Sciences, Chongqing 400015, China;
3. Institute of Chemistry Education, Northeast Normal University, Changchun 130024, China
